Ultra Tee

Women's Size Chart

Click hereto learn more about our different fits and how to choose the size that's right for you.

We strive to make all our products true to size. The sizing chart below is not garment specific, but hopefully, it will give you some guidance when choosing your size. In instances where you’re perhaps in between two sizes then take a look at our recommendations below.

Women's Size Conversion Chart

XS

S

M

L

XL

Australian

6-8

8-10

10-12

12-14

14-16

US

2-4

4-6

6-8

8-10

10-12

European

34-36

36-38

38- 40

40-42

42-44

Altitude Range - 'Contact Fit'

The Altitude range is designed to be a tight, but comfortable, fit. If you size up it will give you a little extra room, but it will still hug your body as that’s what this range is designed to do. If you want a looser fit consider the Ultra or Universal range.

XS

S

M

L

XL

XXL

Bust

inch

30-32

32-34

34-37

37–40

40–42

42 - 45

cm

76 - 82

82 -88

88-94

94-100

100 - 107

108 - 114

Hips

inch

34-36

36-38

38-40

40-42

42-44

44 - 47

cm

84 -90

90-96

70-76

76-82

82-89

111 - 119

Waist

inch

24-26

26–28

28-30

30-32

32-35

35-38

cm

58 -64

64 -70

70- 76

76- 82

82- 89

89-96

Universal and Ultra Range - 'Regular Fit'

These garments are designed true to size, but going up a size in the Ultra will give it a slightly looser fit, whilst remaining sporty. The Universal is already designed as a more casual fit.

XS

S

M

L

XL

XXL

Bust

inch

29.5–32.5

32.5–35.5

35.5–38

38–41

41–44.5

44.5–48.5

cm

75-82.5

82.5-90

90-96.5

96.5-104

104-113

113-123

Hips

inch

33–35.5

35.5–38.5

38.5–41

41–44

44–47

47–50

cm

83.5-90

90-97.5

97.5-104

104 -111.5

111.5-119.5

119-127

Waist

inch

23.5–26

26–29

29–31.5

31.5–34.5

34.5–38.5

38.5–42.5

cm

60-66

66-73.5

73.5-80

80-87.5

87.5-94.5

97.5-108

Women's Stride Tracksuit pants

Measurements include the ankle cuff. Please keep in mind the style of these pants is slightly drop crotch.

Designed with ultra runners in mind the Women's Ultra Tee is as soft and comfortable as ever. Using our new core-spun fabric which combines all the natural benefits of our finest MicroMerino® fabrics with just enough nylon to create our most durable fabric yet, designed to withstand even the most demanding adventures.

Our Ultra Design Series lets you add any one of these 6 designs to our standard red or blue Ultra Tshirt. These are produced in smaller, limited quantities and may take up to 10 days to produce so please allow for this in your delivery time. If you have ordered one of these along with a standard item, your order won't be sent until your Design Series tee is ready. If you prefer a more casual fit, be sure to check out our Universal Design Series Tee. We will continue to have various artworks produced so check back from time to time or sign up to our Outsiders Club to see new designs as they are released. To order a plain version of this tee, simply select 'standard tee’.

Customer Reviews

Is a great cut & lovely soft fabric, I loved it so much I bought a second.

R

R.E.

Amazing top!

I love the ultra tee, it's not as thick as the altitude which I find perfect for running. It's a nice loose fit which is great and does not smell at all. Layers perfectly with the ultra zip. The fabric is so comfy!

A

A.A.

Ultra T

My Ultra T in Silver Pine tones perfectly with my silver hair. I also love having it in XXL which some athletic lines won't stretch to. I went ahead and bought a second one in red because the length and drape are perfect for the wider runner and great as street wear as well.

Thankyou for your great review.

S

S.C.

🧡 so good 🧡

I bought the Ultra round neck T in orange. It is so vibrant. Maybe one day they might make a vibrant pink one - but for now - orange will do nicely. These and the altitude Ts are the only Ts I run in now. Team them up with a pair of iomerino arm warmers and you are good to go.
Slightly looser fit than the altitude Tshirt. I am normally a ladies size M 12/14 in tops. I pick M in the Ultra Range and L in the Altitude Range.

Happy to hear you're loving the Ultra Tees, Sarah! Fingers crossed for a bright pink version in the future!

R

R.

Love it

Love this tee and my other ioMerino pieces. Super comfy in all weather conditions.

M

M.

iO merino Super happy

I have a several iO merino items and I love them all. I am lucky enough to now own an ultra tee and it's fabulous. The merino is super comfortable, breathable and the fit is perfect. I also have to say that the communication/customer service with iO merino was outstanding. They are super helpful and nothing was too much or too hard for them. Excellent products and excellent customer service. Highly recommend :-)

Hi Mhairi, thank you for the positive review. We work hard to make great products with great customer service to match! We’re happy to hear we hit the mark for you!

“ I can honestly say your products are at least 25% better than (that other brand). And I’m a Kiwi. Not to mentioned feeling better about Fiji production and the fact that your cuts fit me better. The weaves are also finer and feel softer. Good on you and please share this with your team. I love supporting you! Heaps good.”

I own ‘a lot’ of high end (& damn expensive) compression leggings as I lift weights regularly. These are EXCELLENT leggings in every way.
They are soft, breathable, temperature regulating, firm fitting yet not pinching at the waist, flexible and squat proof.

I will be wearing these as my every day leggings due to the high waist and comfort factor.
I wear my jeans stretch and tight fitting and am a size AU10 with solid legs and a regular waist and the size Medium fit like a glove. I will absolutely be buying additional pairs.

Loved this top from the moment it arrived. Soft and comfy - my go-to when changing out of the work wear at the end of the day. It's also been my outer running top for cold mornings, then gets tied around my waist once I'm warmed up. Love the fact it can see a lot of wear between washes, and it's held its shape well.

I've just received two more of these after wearing my first two almost every day, winter and summer... so good! So comfy, they fit well and wash and wear well. I'll keep buying these over and over again.

I use these for cycling on cold mornings and find them just right. I like to stop and take photos along the way and I was able to handle both the phone camera and camera pretty well, leaving the gloves on. Lightweight but warm enough. Really happy.

I bought this on a bit of a whim, not sure what to expect. I am a 12/14 so bought the L and it is snug. But fits perfectly. When I buy zip tops in the Altitude range for layering over a base, I will size up. The top is gorgeous though. The fabric quite silky and smooth, and the seams also smooth. As a first time buyer, I am so impressed that such good quality Merino active wear is available in this price range. And I get to buy local which is fantastic. Delivery was easy and quick, given I live regionally and we have issues with postal services due the pandemic. Very happy.

To be honest I think I may need this hoodie surgically removed as it is so comfortable and warm on the cold evenings and mornings! The fleece quality is excellent and the fit good. I love it. I really do. So impressed with the quality.

This jacket is magnificently warm. The knitted finish on the outside hides a wonderfully soft interior. The pockets are roomy and the zip up front and hoodie tie allow you to secure the front of the jacket and dash off into the chilly morning. As you warm up, the zip allows you to circulate air to your body, and of course, it whips off easily when you need to remove it mid-run, and tie it around your waist to complete the run. This is a great jacket and I would strongly recommend it.

Put these socks on for the first time and I heard my feet heave a sigh of relief! I have been given them a hammering wearing them day in and day out but cannot get them to stink up!!J ust loving the feeling of wool on my tootsies!!

Every item I buy from iomerino I wonder how I did without. The socks-amazing!! The long sleeved tops-fanbloomintastic!! The service-brilliant. Do not hesitate to buy these products. They are second to none!!!

I got these for my husband and his first words about them were “so comfy”... He’s loving wearing them for layers and sleeping, as well as recovery after runs. Great fit, no chafing complaints, not stinky or sticky. An all round winner!

This is my second altitude crew top. It looks and feels great. The colours are gorgeous too (boysenberry marle and port marle). I find this top perfect for casual wear, walking, computer cycling, hiking and camping. It looks good on it’s own and fits well under another layer. Great customer service too. The team were very quick and responsive resolving a wee issue.

I bought this hoodie a few years ago and was super excited to see it made a comeback. I wore this thing so much I eventually got holes in it. Money well spent and I was sad that at the time I was not able to order another one. Welcome home hoodie, you have been missed❤

I love the ultra tee, it's not as thick as the altitude which I find perfect for running. It's a nice loose fit which is great and does not smell at all. Layers perfectly with the ultra zip. The fabric is so comfy!

This is great shirt, the logo on the back is really cool. It's probably a little thick for most QLD weather but great for the early morning runs in winter. It does not stink, ever! Tighter fit compared with the ultra tops.

I wear this long sleeve running and hiking. Actually I wear it a lot because it is so comfortable and it doesn't stink like synthetics!! Requires minimal washing. Nice loose fit so you can layer up with a singlet/shirt underneath. No chafing what so ever (even under a hydration pack). I love the zip because you can control the temperature.

Truly, I have never had any product in wool that feels so good quality and that I feel will not wear thin in the sensitive-wear areas. I am a Norwegian and grew up wearing woolen underwear, so I am speaking from experience. I can move with ease and I also do not feel claustrophobic inside too much tight stretch and itchy sweat producing wool. Thanks for making such a great product that I hope (since it looks like it) will last me many years.

Wore my ultra zip today. Went on a short 10k hike, in cold (15deg) wet conditions. I wore it as an outer layer, with a merino singlet under and a rain jacket over the top. It kept me warm and regulated my body temp throughout the day. Love it!

I have owned several pair of these crops for years. I finally had to give in and buy 2 new ones to replace my well-worn old ones. I wear a 4 or 6us shirt, 34B bra and I am 5ft4 about 135 pounds. Medium fits great. I love these things. Great support for my girls for yoga, running, wrangling rescue hounds, hiking. They never stink. I wash them on wool cycle (rarely). are comfortable. Thank you IO!

I bought a few pairs of these after my sister recommended them. Super comfortable. They were great on our trip to Sri Lanka- it was really humid and after a long day of sweating and walking around they were still fresh and I could have worn them the next day if I wanted to. I was so impressed I bought some jocks for my husband and he loves them.

I've been buying merino undies for years and these have the edge over all others. Comfortable waistband and legs and super soft all around. Sizing is spot on. I just wore these for a 12km trail run, so have definitely put them to the test and they passed with flying colours. Oh so good.

So comfortable! Perfect for ski season, will never wear any other base layer again!

I own 3 of the Altitude Zips, worn on various ski trips in France as a base layer under my ski jacket. They have successfully kept me warm in the cold weather, even combatting a hail storm on the slopes this week. They also helped to regulate my body temperature when the sun was shining, I just zipped down the front to keep me a bit cooler. And as promised, no smell, even after 3 days of intense skiing. The colours and design also look quite fashionable for the apres ski :). Quick shipping from Australia to England, arrived in a few days.

I cannot say enough good things about these pants! I found the holy grail! I got the medium and I’m a size 6 in Lululemon Align Pant- my former go-to, before these hit the market- which fit great but never lasted that long, and more importantly were not wool. These are made from the IDEAL merino fabric: soft, stretchy, perfect compression, comfortable, you can wear them day after sweaty day and look sleek, fit and fresh. Warm or cool these pants are making you comfortable. The waist band, fits to your form like the Align (absolutely no muffin top no matter your figure), but with more compression, that makes you look instantly more fit. I’m just so happy to have found my true pant love. Super versatile, from snow, to trail, to treadmill , to studio, to sofa. Worth every single penny. Can’t wait to save up for a second travel pair! The only pant-like-this you need for all seasons and reasons.

I love the fit of these tights, they look tight but the stretch in them means they don't uncomfortably suck you in like other activewear synthetic tights. They are quite high in the waist which is great, don't ride down or require constant adjustments during your workout. They are a lot thinner than I anticipated which is not to be taken as a negative, I just thought they would be quite thick, and they are not see through. The only changes I would like to see would be at least one pocket in the waistband or on the leg and an assortment of lengths & colours!!

I bought one of these in a retail store several years ago and finally wore it out. Came looking for more and was so happy to find IO Merino online! Have one more of these now, and another on the way. We have lots of choices here in the US, but so glad I can order from IO, these people are the BEST! Great service, BEST product, keeps me warm and comfortable.

These thin liners are PERFECT for cycling in all weather. I ride all year in Minneapolis, MN, US, and commute 12 km daily from late March through late November. Of course I need a few more layers as it gets colder, but there is nothing finer than these gloves under my cycling gloves on cool crisp spring and fall days when I need some protection from the cold, and as a base layer all the way down to -10 C.

I am a bicycle commuter in Minneapolis, MN, US, and I ride about 12 km to work every day from late March to late November. We are cold climate. I wear this under my helmet down to about 0 degrees C and it is perfect. Could be just a bit longer to cover the earlobes, but it's still a 5 star product. Below 0 C I need two layers, but this is perfect for most of my cool/cold weather needs. Of course merino wool keeps the rest of my body warm on these rides, so I'm happy!

Fabric Guide

While Merino is an amazing natural fibre, not all Merino fabrics are created equal. At ioMerino, we make our own fabrics, using only the best quality fibres, and to very specific specifications that make the most of the natural benefits of Merino. All of them are 'Merino rich’. No cheap blends passed off as Merino. No cheaper scratchy fibres or synthetic substitutes to save money. No unethical production. And each fabric is made for a specific purpose. So if you see something with a small amount of elastase or nylon added, you can be sure it absolutely needs to be there to enhance the natural stretch and durability.

It took every bit of our 140 years of experience in the wool industry to perfect our fabrics, but we think you’ll agree the end result was more than worth the effort.